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United States Patent | 6,131,554 |
Ito ,   et al. | October 17, 2000 |
A number of embodiments of engines that improve engine performance and lean running stability by employing internal EGR controlled by controlling the volume of the intake passage between the throttle valve and the intake port in relation to the maximum combustion chamber volume.
Inventors: | Ito; Takeshi (Iwata, JP); Hanajima; Toshiharu (Iwata, JP); Mori; Kenji (Iwata, JP) |
Assignee: | Yamaha Hatsudoki Kabushiki Kaisha (Iwata, JP) |
Appl. No.: | 016199 |
Filed: | January 30, 1998 |
Jan 31, 1997[JP] | 9-018552 |
Current U.S. Class: | 123/568.14; 123/90.15; 123/90.17; 123/184.56; 123/306; 123/403; 123/442 |
Intern'l Class: | F01L 001/34; F02M 007/00 |
Field of Search: | 123/568.11,568.14,90.15,308,90.17,306,188.14,442,403,336,184.55,184.56 |
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Foreign Patent Documents | |||
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